package mt;

import java.util.Scanner;

public class Main1_0820 {
    public static void main(String[] args) {
        Scanner cin=new Scanner(System.in);
        int n=cin.nextInt();
        cin.nextLine();
        char[] ac=cin.nextLine().toCharArray();
        char[] bc=cin.nextLine().toCharArray();
        StringBuffer sb=new StringBuffer();
        int p=0;
        for(int i=0;i<n;i++){
            sb.append(ac[i]).append(bc[i]);
        }
        System.out.println(sb.toString());
    }
}
